feat: customizable portal gradient theme + LTC repair form fixes

- Add portal gradient branding settings with 4 presets (Green/Teal,
  Blue/Purple, Sunset Orange, Dark Slate) and custom color picker
- Live preview in settings, onchange updates colors reactively
- Dynamic gradient applied across portal home, CSS, and card elements
- Fix after photos visibility (conditional on resolved=yes)
- Fix technician section gating on portal repair form
- Move Create Sale Order button to form header for visibility
- Fix portal home row width inconsistency (xpath target change)

Co-authored-by: Cursor <cursoragent@cursor.com>

fusion_authorizer_portal/controllers/portal_main.py

@@ -37,6 +37,14 @@ class AuthorizerPortal(CustomerPortal):
                 ])
             response.qcontext['sign_count'] = sign_count
             response.qcontext['sign_module_available'] = sign_module_available
+
+            ICP = request.env['ir.config_parameter'].sudo()
+            g_start = ICP.get_param('fusion_claims.portal_gradient_start', '#5ba848')
+            g_mid = ICP.get_param('fusion_claims.portal_gradient_mid', '#3a8fb7')
+            g_end = ICP.get_param('fusion_claims.portal_gradient_end', '#2e7aad')
+            response.qcontext['portal_gradient'] = (
+                'linear-gradient(135deg, %s 0%%, %s 60%%, %s 100%%)' % (g_start, g_mid, g_end)
+            )
         
         return response